<template>
  <div class="swiper-container">
    <div class="swiper-wrapper" ref="cur">
      <div
        class="swiper-slide"
        v-for="(slide, index) in skuImageList"
        :key="index"
      >
        <img
          :src="slide.imgUrl"
          :class="{ active: currentIndex == index }"
          @click="changeIndexUrl(slide,index)"
        />
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>
import Swiper from 'swiper'
export default {
  name: "ImageList",
  data () {
    return {
      //控制小图类名的索引值
      currentIndex: 0,
    }
  },
  props: ['skuImageList'],
  computed: {
    imgObj () {
      return this.skuImageList || []
    }
  },
  methods:{
    changeIndexUrl(slide,index){
      this.currentIndex = index
      this.$bus.$emit('getIndex',this.currentIndex)
    }
  },
  watch: {
    // 监听数据：可以保证数据一定ok,但是不能保证v-for遍历结构是否完事
    skuImageList (newVal, oldVal) {
      this.$nextTick(() => {
        new Swiper(this.$refs.cur, {
          // 如果需要前进后退按钮
          navigation: {
            nextEl: ".swiper-button-next",
            prevEl: '.swiper-button-prev'
          },
          // 显示几张图片设置
          slidesPerView: 2
        })
      })
    }
  }
}
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }

      &:hover {
        border: 2px solid #f60;
        padding: 1px;
      }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>